CAT5110, CAT5118, CAT5119
CAT5123, CAT5124, CAT5125
32-Tap MiniPot™ Digitally Programmable
Potentiometers with 2-Wire Interface
FeATures
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■
■
■
■
■
DesCrIPTIOn
CAT50/58/59/523/524/525 linear-taper
digitally programmable potentiometers perform the same
function as a mechanical potentiometer or a variable
resistor. These devices consist of a fixed resistor and
a wiper contact with 32-tap points that are digitally
controlled through a 2-wire up/down serial interface.
The CAT5110 and CAT5125 are configured as poten-
tiometers. The CAT5118/19/23/24 are configured as
variable resistors.
Three resistance values are available: 10kΩ, 50kΩ and
100kΩ. All devices are available in space-saving 5-pin
and 6-pin SOT-23 packages. The CAT50/58/59
are also available in the SC70 package.
0.3µA ultra-low standby current
single-supply operation: 2.7V to 5.5V
Glitchless switching between resistor taps
Power-on reset to midscale
2-Wire up/down serial interface
Resistance values: 10kΩ, 50kΩ and 100kΩ
All devices available in sOT-23 package
CAT5110, CAT5118, CAT5119 also available in
sC70
APPlICATIOns
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lCD screen adjustment
Volume control
Mechanical potentiometer replacement
Gain adjustment
line impedance matching
FunCTIOnAl DIAGrAM
H
V
DD
GND
32-POSITION
DECODER
CS
UP-DOWN
COUNTER
W
For Ordering Information details, see page 11.
U/D
PIn COnFIGurATIOn
sOT-23
V
DD
6
H
V
DD
L
sOT-23
5
H
V
DD
sOT-23
6
H
GND 2
5 W
GND 2
GND 2
5 L
U/D 3
CAT5110
CAT5125
4
CS
U/D 3
CAT5118
CAT5123
4
CS
U/D 3
CAT5119
CAT5124
4
CS
sC70
V
DD
6
H
V
DD
sC70
5
H
V
DD
sC70
6
H
GND 2
5 W
GND 2
GND 2
5 L
U/D 3
CAT5110
4
CS
U/D 3
CAT5118
4
CS
U/D 3
CAT5119
4
CS
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 220, Rev. E
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
PIn DesCrIPTIOns
Pin number
CAT5110/
CAT5125
2
3
4
-
5
6
CAT5118/
CAT5123
2
3
4
-
-
6
CAT5119/
CAT5124
2
3
4
5
-
6
Pin name Description
V
DD
GND
U/D
CS
L
W
H
Power Supply
Ground
Up/Down Control Input. With CS low, a low-to-high transition
increments or decrements the wiper position.
Chip Select Input. A high-to-low CS transition determines the
mode: increment if U/D is high, or decrement if U/D is low.
Low Terminal of Resistor
Wiper Terminal of Resistor
High Terminal of Resistor
AbsOluTe MAxIMuM rATInGs
(1)
V
DD
to GND
All Other Pins to GND
Input and Output Latch-Up Immunity
Maximum
Continuous Current into H, L and W
100kΩ
50kΩ
10kΩ
Continuous Power Dissipation (T
A
= +70ºC)
5-pin SC70*
6-pin SC70*
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Soldering Temperature (soldering, 0s)
247mW
245mW
-40°C to +85ºC
+50ºC
-65ºC to +50ºC
+300ºC
-0.3V to +6V
-0.3V to (V
DD
+ 0.3)V
±200mA
±0.6mA
±.3mA
±.3mA
notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification
is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(*) Derate 3.mW/ºC above T
A
= +70ºC
Doc. No. 220, Rev. E
2
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
eleCTrICAl CHArACTerIsTICs
V
DD
= 2.7V to 5.5V, V
H
= V
DD
, V
L
= 0, T
A
= -40ºC to 85ºC. Typical values are at V
DD
= 2.7V, T
A
= 25ºC, unless
otherwise noted.
Parameter
DC Performance
Resolution
End-to-End Resistance (-00)
End-to-End Resistance (-50)
End-to-End Resistance (-0)
End-to-End Resistance Tempco
Ratiometric Resistance Tempco
Integral Nonlinearity
Differential Nonlinearity
Full-Scale Error
Zero-Scale Error
Wiper Resistance
Digital Inputs
Input High Voltage
Input Low Voltage
U/D Mode to CS Setup
CS to U/D Step Setup
CS to U/D Step Hold
U/D Step Low Period
U/D Step High Period
Up/Down Toggle Rate
()
V
IH
V
IL
t
CU
t
CI
t
IC
t
IL
t
IH
f
TOGGLE
100kΩ variable
resistor
configuration,
C
L
= 0pF
100kΩ potentiometer
configuration,
C
L
= 0pF
2.7
V
DD
= +5V
0.3
25
50
25
25
25
μs
0.25
0.7 x V
DD
0.3 x V
DD
V
V
ns
ns
ns
ns
ns
MHz
R
W
CAT50/8/9
CAT523/24/25
200
80
INL
DNL
±0.
600
200
TC
R
32
80
40
8
00
50
0
200
5
±0.5
±
±
20
60
2
ppm/ºC
ppm/ºC
LSB
LSB
LSB
LSB
Ω
kΩ
Taps
symbol
Conditions
Min
Typ
Max
units
Timing Characteristics (Figures 1, 2)
Output Settling Time
(2)
t
SETTLE
Power supply
Supply Voltage
Active Supply Current
(3)
Standby Supply Current
(4)
notes:
() Up/Down Toggle Rate:
f
TOGGLE
=
t
SETTLE
V
DD
I
DD
I
SB
5.5
25
V
µA
µA
(2) Typical settling times are dependent on end-to-end resistance.
(3) Supply current measured while changing wiper tap, f
TOGGLE
= MHz.
(4) Supply current measured while wiper position is fixed.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc No. 220, Rev. E
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
TyPICAl OPerATInG CHArACTerIsTICs
T
A
= 25ºC, unless otherwise noted.
160
140
120
100
RW (Ω)
WIPER POSITION
CAT5110/5118/5119
50K
80
60
40
20
0
0
5
CAT5123/5124/5125
V
DD
= 2.7V
10 15 20 25
WIPER POSTION
30
V
DD
= 5.5V
V
DD
= 2.7V
Doc. No. 220, Rev. E
4
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
FunCTIOnAl DesCrIPTIOn
The CAT50/58/59/523/524/525 consist of
a fixed resistor and a wiper contact with 32-tap points
that are digitally controlled through a 2-wire up/down
serial interface. Three end-to-end resistance values are
available: 0kΩ, 50kΩ and 00kΩ.
The CAT50/525 is designed to operate as a
potentiometer. In this configuration, the low terminal of
the resistor array is connected to ground (pin 2).
The CAT58/523 performs as a variable resistor. In
this device, the wiper terminal and high terminal of the
resistor array are connected at pin 5. The CAT59/524
is a similar variable resistor, except the low terminal is
connected to pin 5.
DIGITAl InTerFACe OPerATIOn
The MiniPots have two modes of operation when the
serial interface is active: increment and decrement mode.
The serial interface is only active when CS is low.
The CS and U/D inputs control the position of the wiper
along the resistor array. When CS transitions from high
to low, the part will go into increment mode if U/D input
is high, and into decrement mode when U/D input is low.
Once the mode is set, the device will remain in that mode
until CS goes high again. A low-to-high transition at the
U/D pin will increment or decrement the wiper position
depending on the current mode (Figures and 2).
When the CS input transitions to high (serial interface
inactive), the value of the counter is stored and the wiper
position is maintained.
Note that when the wiper reaches the maximum (or
minimum) tap position, the wiper will not wrap around
to the minimum (or maximum) position.
POWer-On reseT
All parts in this family feature power-on reset (POR)
circuitry that sets the wiper position to midscale at power-
up. By default, the chip is in the increment mode.
Figure 1. serial Interface Timing Diagram, Increment Mode
CS
t
CU
t
IL
U/D
t
CI
t
SETTLE
t
IC
t
IH
t
SETTLE
W
Note: "W" is not a digital signal. It represents wiper transitions.
Figure 2. serial Interface Timing Diagram, Decrement Mode
CS
t
CU
U/D
t
IH
t
IC
t
IL
W
t
CI
t
SETTLE
t
SETTLE
Note: "W" is not a digital signal. It represents wiper transitions.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 220, Rev. E
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